Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1985-05-16
1987-10-06
Howell, Janice A.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250266, 250264, G01V 512
Patent
active
046985018
ABSTRACT:
A system for logging subterranean formations for the determination of formation density by using gamma radiation. Gamma ray source and detection means are disposed within a housing adapted for positioning within a borehole for the emission and detection of gamma rays propagating through earth formations and borehole drilling fluid. The gamma ray detection means comprises first and second gamma radiation sensors geometrically disposed within the housing the same longitudinal distance from the gamma ray source and diametrically opposed in a common plane. A formation matrix density output signal is produced in proportion to the output signal from each of the gamma ray sensors and in conjunction with certain constants established by the geometrical configuration of the sensors relative to the gamma ray source and the borehole diameter. Formation density is determined without regard to the radial position of the logging probe within the borehole in a measuring while drilling mode.
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Howell Janice A.
NL Industries Inc.
Porta David P.
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